Dynamo-electric machine.



W. s. KELLEY. DYNAMO ELECTRIC MACHINE. APPLICATION FILED FEB.10,1908

Patented Aug. 17, 1909.

d afl/ di e del? WALTER S. KELLEY, OF BROKLINE, MASSACHUSETTS.

Specification of Letters Patent. l

DYNAMo-ELEcT-nrc MGHINE- Patented Aug. 17', 1.909.

Applicationl filed. February 10, 1908. Serial No. l15,208.

To all 'whom it may concern:

Be it known that I, WALTER S. KELLEY, a

citizen` of the United States, residing at Brookline, in the county of Norfolk andState of Massachusetts, have invented an Improvement in Dynamo-Electric Machines, of which by means of a key or feather.

the following description, in connection with the accompanying drawings, is a speciiication, like letters on the drawings represent. ing like parts.

The present invention relates to a i ynamo electric machine, and is shown as -embodied in a motor ol' the induction type, although the invention may be applied to any laminated structure for ldynamo-electric machinery. y

The invention is mainly embodied in the construction of the armature and field members, and the'fastening devices which hold the said members in place.

vFor the purpose .ol' illustrating and describing the invention, a'motor of the socalled squirrel cage type has been chosen,` and-in the construction shown, the armature laminac arearranged to be mounted directly uponthe yarmature shaft, being punched Withalined central cpenings of the right'size to t over the shaft and to be held thereon The laniinae punched in this Way are held together by means of tubular fastening devices .or rivets Awhich are passed through openings symmetrically arranged in the lamin and provided ivith shoulders at their outer ends to clamp all the laminac together. The field laminas are similarly. connected, being preferablyprovided With alined ears or lugs.

which project beyond the normal section of themagnetic field, there being tivo annular members at opposite sides ofthe field provided With corresponding lugs, the said annular members and thelaminte being clamped together by means of tubular rivets similar to those described in connection with the armature. The vtivo annular members are provided with shouldersadapted to receive the end members of thev motor frame which contain the armature bearings, and by the construction above described these annular shoulders can be machined after the field laminze are clamped in place, the frame members then being secured tothe ield by means of bolts Which pass through the tubular rivets.

Figure 1 is an end elevation of embodyingthe invention; Fig. 2 is a side a machine elevation, parts being broken out and shown in section on the plane indicated by the line :t2 of Fig.) 3 is an end view, partly in section',l of the field member and armature,

with the motor frame omitted; Fig. 4 is a vertical, longitudinal section of the machine, with part of the frame shoivn in elevation; and Fig. 5 ,is a sectional detail taken on the line x5 of Fig. 3. y The Iarmature aconsists of lamin properly notched to receive thc cross conductors a2 which `are supported'at opposite-rends iii annular rings c3, as is customary in this type in assembling the armature,

of machine. the laminay which are unched with the notches for the -cross con uctors c2 and with central openingsr for the armature shaft c4,

are held together'by means of tubular members e5 which passl through symmetrically arranged openings in the lamiiite, the said n tubular members being provided at the outer ends with shoulders a, to hold thegl-'T lamiiie together. The shoulders at the ends of the tubular members may be provided in any suitable way, it being practicable, for

example, tovupset or spin out the ends ofthe tubular Amembers themselves, as shown. Thiscoiistruction :is ineXpensive,'and the intermediate supporting member for'. the laminze which is commonly connected directly with the shaft may, in some cases, be

dispensed With, as shown, the `tubular fastening devices, moreover, affording ventilating openings which aidV in keepin machine cool. A'further advantage o this. construction consists in the means afforded for obtaining a perfect mechanical balance of the armature, Without cutting away, or addingito any part thereof Where-suoli reneiv'al or addition of metal .may injure the structure yor disturb the electrical balance. Such mechanical balance may be obtained, as shown in Fig. 4, by inserting additional material, such as pieces of imetal 0,7, in the` tubular fastening members. Pieces of iron piping eut yto such lengths as have the desired Weight, are suitablfe'for this purpose, and do not interfere with the ventilation. i

to receive the field Winding. are provided with openings -to .receive transverse fastening devices indicated as tubular-members c similar to the tubular members a5 described in connection With the armature construction. In the construction shown, the openthe atVv

. y The field 4laminae b having the notches b2 i' ings are formed in fears yory extensions b3,

v which project beyond the normal pathof the magnetic flux, but this location o the openings, While desirable; 'is not essential to the invention. The field laminae are clamped by means of said members between two annular plates b through which the members c extend, being upset or spun over in countersunli recesses, as indicated at c2, to holdv Athe parts all ltogether yThe annular rings b4 are provided with shoulders. b5 which arel arranged -to receive and -center the end frame members d of the motor, 'which members are shown as constituting the support for the motor, being provided with standards d2, as Well as supporting the bearings d3 for the armature shaft a4. After the field lamina*J have vbeen clamped in )osition vbetween the end members b4, the sioulder b5 may be machined so as to. 'bring all the parts into the properalinement, and the frame members d are' then secured in 'posiperfectly lsymmetrical andnwithout projec` tions to take u s ace or interfere 1vvith* han- Botho` t lese considerations are im tion by means of bolts dlwhich extend through the vtubular fastening devices As Will be seen from the foregoing description, the structure is very strong, and, furthermore, is very inexpensive, in viewof the accuracy with which the parts may be put tcgether,.it being practicable to use .the castings in the rough, for the most part, the only machining or finishing necessary being that' of the frame members d and of the shoulders 'b5 along the surfaces Where the said frame members and shoulders come together.

Furthermore, a field structure made up, as

hereinbefore.described, of laminas clamped in position between the endmembers bi by meansof the tubular fastening Ydevices c5,

'Y i is a very convenient form for packing and storage, and for handling When'Winding the coils in the field siots; as the structure vis portant from a manufacturing standpoint."

Claims v I l. In a dynamoelectric machine, a lami- 1 nated field; annularclamping members be tween Which the laminae of said `field are clamped; annular shoulders formed on said clamping members, tubular fastening de vices extending through said clamping members andthe laminae and expanded at opposite ends; supporting frame members fitteed on said shoulders; and bolts extendin :through openings insaid frame members an through said tubular fastening 1n embers,

whereby the laminae and the frame members i are all clamped together.

2. In a` dynamo electric machine, afield consisting of laminas each provided with ears or extensions projecting beyond the normal path of the magnetic flux; annular clam ing plates at opposite ends, said annular p at'es and said ears beingprovided With openings; tubular fastening devices extending throu said openings and enlarged at the outer en s i frame members at opposite ends of said said annular shoulders; boltsy extending 80 through said frame members and the tubular fastening devices whereby the field is' clamped in the frame an armature shaft A bearing in the framel members; lami'n mounted on said shaft ,.tubul a`r fastening devicesextending through said laminae and expanded at the ends to clamp them together; and tubular,v Weights inserted in said tubular fastening devices to balance said armature 90 Without interfering with the ventilation. thereof. 2

In testimony whereof, I havesigned my name to this specification in the presence of tWo subscribing Witnesses.'

' WALTER S. KELLEY.

Witnesses JAs. J. MALONEY, v

E. @o vnivnv. 

